Which of the following is a prime number? Why?

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Which of the following is a prime number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a prime number? Why? 4 9 10 13

Which of the following is a prime number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a prime number? Why? 4 9 10 13 A prime number is a number whose only factors are 1 and the number.

Which of the following is a prime number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a prime number? Why? 4 9 10 13 A prime number is a number whose only factors are 1 and the number. The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4).

Which of the following is a prime number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a prime number? Why? 4 9 10 13 A prime number is a number whose only factors are 1 and the number. The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4). The number 9 has the factors 1 and 9, but also 3 (3 x 3 = 9).

Which of the following is a prime number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a prime number? Why? 4 9 10 13 A prime number is a number whose only factors are 1 and the number. The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4). The number 9 has the factors 1 and 9, but also 3 (3 x 3 = 9). The number 10 has the factors 1 and 10, but also 2 and 5 (2 x 5 = 10).

Which of the following is a prime number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a prime number? Why? 4 9 10 13 A prime number is a number whose only factors are 1 and the number. The number 4 has the factors 1 and 4, but also 2 (2 x 2 = 4). The number 9 has the factors 1 and 9, but also 3 (3 x 3 = 9). The number 10 has the factors 1 and 10, but also 2 and 5 (2 x 5 = 10). The number 13 has only two factors, 1 and 13, so it is a prime number!

Which of the following is a composite number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a composite number? Why? 3 7 12 17

Which of the following is a composite number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a composite number? Why? 3 7 12 17 A composite number is a number that can be divided evenly by numbers other than 1 and itself.

Which of the following is a composite number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a composite number? Why? 3 7 12 17 A composite number is a number that can be divided evenly by numbers other than 1 and itself. The number 3 can only be divided by the numbers 1 and 3.

Which of the following is a composite number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a composite number? Why? 3 7 12 17 A composite number is a number that can be divided evenly by numbers other than 1 and itself. The number 3 can only be divided by the numbers 1 and 3. The number 7 can only be divided by the numbers 1 and 7.

Which of the following is a composite number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a composite number? Why? 3 7 12 17 A composite number is a number that can be divided evenly by numbers other than 1 and itself. The number 3 can only be divided by the numbers 1 and 3. The number 7 can only be divided by the numbers 1 and 7. The number 17 can only be divided by the numbers 1 and 17.

Which of the following is a composite number? Why? UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) Which of the following is a composite number? Why? 3 7 12 17 A composite number is a number that can be divided evenly by numbers other than 1 and itself. The number 3 can only be divided by the numbers 1 and 3. The number 7 can only be divided by the numbers 1 and 7. The number 17 can only be divided by the numbers 1 and 17. The number 12 can be divided by the numbers 1 and 12, but also by 2, 3, 4, and 6. Twelve is a composite number because it has 3 or more factors.

UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) The number 18 is a composite number. What are the prime numbers that are factors of 18?

UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) The number 18 is a composite number. What are the prime numbers that are factors of 18? Let’s break the number 18 down into its prime factors. 18

UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) The number 18 is a composite number. What are the prime numbers that are factors of 18? Let’s break the number 18 down into its prime factors. 18 can be divided into the factors 2 and 9. 18 2 9

UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) The number 18 is a composite number. What are the prime numbers that are factors of 18? Let’s break the number 18 down into its prime factors. 18 can be divided into the factors 2 and 9. 9 can be divided into the factors 3 and 3. 18 2 9 3 3

UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) The number 18 is a composite number. What are the prime numbers that are factors of 18? Let’s break the number 18 down into its prime factors. 18 can be divided into the factors 2 and 9. 9 can be divided into the factors 3 and 3. 18 2 and 3 are prime numbers; they cannot be divided by any other numbers besides 1 and themselves. 2 9 3 3

UNIT 1 – RATIONAL NUMBERS, EXPONENTS AND SQUARE ROOTS Prime and Composite Numbers (Algebra 1.1) The number 18 is a composite number. What are the prime numbers that are factors of 18? Let’s break the number 18 down into its prime factors. 18 can be divided into the factors 2 and 9. 9 can be divided into the factors 3 and 3. 18 2 and 3 are prime numbers; they cannot be divided by any other numbers besides 1 and themselves. 2 9 Therefore, the prime numbers that are factors of 18 (or the prime factors of 18) are 2, 3, and 3. 3 3